标题： F型恒星的统计学宜居性——行星系统 显示英文标题

标题： Statistics and Habitability of F-type Star--Planet Systems

摘要： F型恒星-行星系统为宜居性研究提供了有趣的案例。 尽管F型恒星在主序上的时间比G、K和M型恒星少得多，但它们仍然提供了一组独特的特征，使外星生命的存在成为可能。 后者的例子包括恒星宜居带的宽度增加以及紫外线通量的增强，适度的紫外线通量可能有助于宇宙中生命的起源。 在这项研究中，我们利用NASA系外行星档案馆对目前已知的F型恒星宿主行星系统进行了详细的统计分析。 在排除了缺乏关于行星信息的系统之后，我们确定了206个感兴趣的系统。 我们还根据各种标准评估了这些恒星是否位于主序上。 在一种方法中，我们使用了恒星演化代码MESA。 根据所采用的标准，大约有60到80颗恒星被识别为主序星。 在18个系统中，行星在其轨道的至少一部分时间内位于恒星宜居带内。 在其中一个例子中，即HD 111998，通常被称为38室女座，这颗行星始终位于宜居带内。 我们的工作可以作为未来研究的基础，包括对F型系统中地球质量行星存在性的研究，以及对由较低质量宜居带行星（目前识别出的最低质量为143个地球质量）所主持的可能宜居的系外卫星的调查。 显示英文摘要

摘要： F-type star--planet systems represent an intriguing case for habitability studies. Although F-type stars spend considerably less time on the main-sequence than G, K, and M-type stars, they still offer a unique set of features, allowing for the principal possibility of exolife. Examples of the latter include the increased widths of stellar habitable zones as well as the presence of enhanced UV flux, which in moderation may have added to the origin of life in the Universe. In this study, we pursue a detailed statistical analysis of the currently known planet-hosting F-type stars by making use of the NASA Exoplanet Archive. After disregarding systems with little or no information on the planet(s), we identify 206 systems of interest. We also evaluate whether the stars are on the main-sequence based on various criteria. In one approach, we use the stellar evolution code MESA. Depending on the adopted criterion, about 60 to 80 stars have been identified as main-sequence stars. In 18 systems, the planet spends at least part of its orbit within the stellar habitable zone. In one case, i.e., HD 111998, commonly known as 38 Vir, the planet is situated in the habitable zone at all times. Our work may serve as a basis for future studies, including studies on the existence of Earth-mass planets in F-type systems, as well as investigations of possibly habitable exomoons hosted by exo-Jupiters as the lowest-mass habitable zone planet currently identified has a mass estimate of 143 Earth masses.